LoRA adapter trained from a fresh Qwen/Qwen2.5-1.5B-Instruct checkpoint with TRL DPO. The fictional persona prioritizes evidence, honesty, concise practical answers, and respect. 18 course PRISM tasks; 378 ordered preference pairs including an edited best answer. Learning rate 5e-05; 2 epochs; batch size 1; accumulation 8; beta 0.1. 4-bit NF4 base; LoRA rank 8, alpha 16, dropout 0.05; seed 329. Rankings and edited answers were drafted with AI assistance for a user-selected persona. User review status is recorded in the accompanying preference-label provenance file. These labels are persona preferences, not a representative human preference survey. The notebook compares base and DPO…